Quantum GIS API Documentation  1.7.4
src/core/qgsoverlayobjectpositionmanager.h
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00001 /***************************************************************************
00002                          qgsoverlayobjectpositionmanager.h  -  description
00003                          ---------------------------------
00004     begin                : January 2007
00005     copyright            : (C) 2007 by Marco Hugentobler
00006     email                : marco dot hugentobler at karto dot baug dot ethz dot ch
00007  ***************************************************************************/
00008 
00009 /***************************************************************************
00010  *                                                                         *
00011  *   This program is free software; you can redistribute it and/or modify  *
00012  *   it under the terms of the GNU General Public License as published by  *
00013  *   the Free Software Foundation; either version 2 of the License, or     *
00014  *   (at your option) any later version.                                   *
00015  *                                                                         *
00016  ***************************************************************************/
00017 
00018 #ifndef QGSOVERLAYOBJECTPOSITIONMANAGER_H
00019 #define QGSOVERLAYOBJECTPOSITIONMANAGER_H
00020 
00021 #include <QList>
00022 #include "qgis.h"
00023 
00024 class QgsRenderContext;
00025 class QgsVectorLayer;
00026 class QgsVectorOverlay;
00027 
00031 class QgsOverlayObjectPositionManager
00032 {
00033   public:
00034     //virtual destructor needed for proper memory management
00035     virtual ~QgsOverlayObjectPositionManager() {}
00038     virtual void addLayer( QgsVectorLayer* vl, QList<QgsVectorOverlay*>& overlays ) = 0;
00040     virtual void removeLayers() = 0;
00044     virtual void findObjectPositions( const QgsRenderContext& context, QGis::UnitType unitType ) = 0;
00045 };
00046 
00047 #endif
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